WO2020127323A1

WO2020127323A1 - Solid composition for dyeing or lightening keratin fibers comprising a phospholipid

Info

Publication number: WO2020127323A1
Application number: PCT/EP2019/085726
Authority: WO
Inventors: Chrystel POURILLE
Original assignee: L'oreal
Priority date: 2018-12-18
Filing date: 2019-12-17
Publication date: 2020-06-25
Also published as: FR3089794A1; FR3089794B1

Abstract

The present invention relates to a solid composition for dyeing or enlightening keratin fibers, comprising: (a) one or more compounds chosen from chemical oxidizing agents and oxidation bases and (b) one or more phospholipids in a specific amount. The present invention also relates to a packaging article containing said composition. The present invention also relates to processes for dyeing or lightening keratin fibers using said composition or said packaging article. Finally, the present invention relates to the use of said composition or of said packaging article for dyeing or lightening keratin fibers, and in particular human keratin fibers such as the hair.

Description

Title: Solid composition for dyeing or lightening keratin fibers comprising a phospholipid

The present invention relates to a solid composition for dyeing or lightening keratin fibers, in particular human keratin fibers such as the hair, comprising a chemical oxidizing agent and/or and oxidation base and a phospholipid in a specific amount.

The present invention also relates to a packaging article containing said composition.

The present invention also relates to processes for dyeing or lightening keratin fibers using said composition or said packaging article.

Finally, the present invention relates to the use of said composition or of said packaging article for dyeing or lightening keratin fibers, and in particular human keratin fibers such as the hair.

Many people have sought for a long time to modify the color of their hair, to dye it or to lighten it.

Lightening compositions containing one or more oxidizing agents are used to lighten hair. Among these oxidizing agents, the ones most conventionally used are hydrogen peroxide or compounds that are capable of producing hydrogen peroxide by hydrolysis, such as urea peroxide or persalts such as perborates, percarbonates and persulfates, hydrogen peroxide and persulfates being particularly preferred.

These compositions may be aqueous compositions containing alkaline agents (amines or aqueous ammonia) that are diluted at the time of use with an aqueous hydrogen peroxide composition.

These compositions may also be formed from anhydrous products, which are powders or pastes, and which contain alkaline compounds (amines and/or alkaline silicates), and a peroxygenated reagent such as ammonium or alkali metal persulfates, perborates or percarbonates, which is diluted at the time of use with an aqueous hydrogen peroxide composition.

Moreover, to obtain permanent hair colorings, it is known practice to use dye compositions containing oxidation dye precursors, which are generally known as oxidation bases, such as ortho- or para-phenylenediamines, ortho- or para- aminophenols, or heterocyclic compounds such as pyrazoles, pyrazolinones or pyrazolo-pyridines. These oxidation bases are colorless or weakly colored compounds which, when combined with oxidizing products, may give rise to colored compounds via a process of oxidative condensation.

It is also possible to vary the shades obtained with these oxidation bases by combining them with couplers or color modifiers. The variety of molecules used as oxidation bases and couplers allows a wide range of colors to be obtained on the keratin fibers.

The oxidation dyeing process thus consists in applying to keratin fibers a dye composition comprising oxidation bases or a mixture of oxidation bases and couplers an oxidizing agent, in leaving it to diffuse, and then in rinsing the fibers thus treated.

The colorings resulting therefrom have the advantage of being permanent, strong and resistant to external agents, in particular to light, bad weather, washing, perspiration and rubbing.

Dyeing compositions can be in various galenic forms, in particular powders, granules, pastes or creams, or in liquid form.

Since these dyeing or lightening compositions comprise oxidizing agents and alkaline agents, they sometimes cause a feeling of discomfort which results in local tingling and/or heating of the scalp.

It is already known practice to protect keratin fibers that have to be subjected to or that have been subjected to dyeing using a dye precursor, in particular by using specific polymers. However, this protection is not completely satisfactory; it can in particular lead to dyeing that is less powerful due to the presence of these polymers.

The presence of fatty substances in dyeing or lightening compositions which are in liquid or cream form also makes it possible to reduce the discomfort of such compositions.

However, in solid compositions, the introduction of fatty substances has a tendency to destabilize them.

Thus, there is a real need to provide solid dyeing or lightening compositions which do not have the abovementioned drawbacks, and in particular which limit the discomfort that may be felt by the consumer during dyeing or bleaching.

The dyeing compositions must also preserve good dyeing properties, in particular they must provide chromatic, powerful, intense and sparingly selective colorings, that is to say colorings that are uniform along the length of the keratin fiber. They must also be resistant to external attacks, such as washing, sweat, light or chemical treatments such as permanent reshaping. The lightening compositions must also result in a good level of lightening, which is uniform from the root to the end.

The applicant has discovered, surprisingly, that a solid dyeing or lightening composition, comprising one or more oxidation bases and/or one or more chemical oxidizing agents, combined with one or more phospholipids in a specific amount, makes it possible to achieve the objectives set out above; in particular to obtain a solid dyeing or lightening composition which limits the discomfort on application, while at the same time having good dyeing or lightening properties as described above.

A subject of the present invention is in particular a solid composition for dyeing or lightening keratin fibers, in particular human keratin fibers such as the hair, comprising:

(a) one or more compounds chosen from chemical oxidizing agents and oxidation bases;

(b) one or more phospholipids, said phospholipid(s) being present in the composition in a content ranging from 5 to 30% by weight relative to the total weight of the composition ;

(c) optionally one or more oxidation couplers.

Such a composition makes it possible in particular to limit the discomfort that may be felt on the scalp at the time of application or after this application, while at the same time retaining powerful dyeing for the dyeing compositions, or a good level of lightening for the lightening compositions.

A subject of the present invention is also a packaging article comprising: i) an envelope defining at least one cavity, the envelope comprising water-soluble and/or liposoluble fibers, preferably water-soluble fibers; and

ii) a solid dyeing or lightening composition as defined previously;

it being understood that the solid dyeing or lightening composition is in one of the cavities defined by the envelope i).

The present invention also relates to a process for dyeing or lightening keratin fibers, in particular human keratin fibers such as the hair, comprising the following successive steps:

- applying to said keratin fibers a ready-to-use composition resulting from the mixing of a solid dyeing or lightening composition, as defined previously, and of a cosmetically acceptable liquid medium,

- leaving the ready-to-use composition on said keratin fibers, - rinsing said keratin fibers, and

- optionally shampooing said keratin fibers, rinsing them and drying them.

A subject of the present invention is also a process for dyeing or lightening keratin fibers, in particular human keratin fibers such as the hair, comprising the following successive steps:

- mixing a packaging article, as defined previously, with a composition that is capable of dissolving the envelope of said packaging article,

- applying the resulting composition to said keratin fibers,

- leaving said resulting composition on said keratin fibers,

- rinsing said keratin fibers, and

- optionally shampooing said keratin fibers, rinsing them and drying them.

The present application also relates to the use of a solid dyeing or lightening composition, as defined previously, for dyeing or lightening keratin fibers, and in particular human keratin fibers such as the hair.

The present invention also relates to the use of a packaging article, as defined previously, for dyeing or lightening keratin fibers, and in particular human keratin fibers such as the hair.

Other subjects, characteristics, aspects and advantages of the invention will emerge even more clearly on reading the description and the examples that follow.

In the text hereinbelow, and unless otherwise indicated, the limits of a range of values are included within that range, especially in the expressions“between” and “ranging from ... to ...”.

Moreover, the expressions“at least one” and“at least” used in the present description are equivalent to the expressions“one or more” and“greater than or equal to”, respectively.

The term“keratin materials” preferably denotes human keratin materials, such as the skin, the scalp and human keratin fibers, and more preferentially the hair.

The term“solid composition” is intended to mean a composition that can be in powder, paste or particle form (for example spherical particles such as small balls).

The term“powder” is intended to mean a composition in pulverulent form, with particles which have a size of less than or equal to 5 mm (particle size evaluated by means of a Retsch AS 200 Digit particle size analyzer; oscillation height: 1.25 mm/screening time: 5 minutes). Advantageously, the particle size is between 1 pm and 3 mm and more particularly between 5 pm and 2 mm. The term“particles” is intended to mean small fractionated objects formed from solid particles aggregated together, of variable shapes and sizes. They may have a regular or irregular shape. They may in particular have a spherical shape (such as granules, granular material, balls), a square shape, a rectangular shape, or an elongated shape such as rods. Spherical particles are most particularly preferred.

The term "paste" is intended to mean a composition with a viscosity of greater than 5 poises and preferably greater than 10 poises, measured at 25°C and at a shear rate of 1 s ¹; this viscosity may be determined using a cone -plate rheometer.

The solid composition according to the invention can be in the form of a compressed solid composition, in particular compressed using a manual or mechanical press.

Solid dyeing or lightening composition

The solid dyeing or lightening composition comprises one or more compounds chosen from oxidation bases and chemical oxidizing agents.

Oxidation bases

The solid composition according to the present invention may comprise one or more oxidation bases. Preferably, the oxidation bases are chosen especially from heterocyclic bases and benzene-based bases, the addition salts thereof, the solvates thereof, and mixtures thereof.

The oxidation bases that may be used in the composition of the invention are chosen especially from para-phenylenediamines, bis(phenyl)alkylenediamines, para- aminophenols, ortho-aminophenols and heterocyclic bases, the addition salts thereof, the solvates thereof, and mixtures thereof.

Among the para-phenylenediamines that may be mentioned are, for example, para-phenylenediamine, para-toluenediamine, 2-chloro-para-phenylenediamine, 2,3- dimethyl-para-phenylenediamine, 2, 6-dimethyl -para-phenylenediamine, 2,6-diethyl- para-phenylenediamine, 2,5-dimethyl-para-phenylenediamine, N,N-dimethyl-para- phenylenediamine, N,N -diethyl-para-phenylenediamine, N,N-dipropyl-para- phenylenediamine, 4-amino-N,N-diethyl-3-methylaniline, N,N-bis( -hydroxyethyl)- para-phenylenediamine, 4-N,N-bis(0-hydroxycthyl)ami no-2- mcthylani line, 4-N,N- b i s ( b - h y d ro x y c t h y 1 ) a in i n o - 2 - c h 1 o ro aniline, 2- -hydroxyethyl -para- phenylenediamine, 2-methoxymethyl-para-phenylenediamine, 2-fluoro-para- phenylenediamine, 2-isopropyl -para-phenylenediamine, N - ( b - h y d ro x y p ro p y 1 ) - p a r a - phenylenediamine, 2-hydroxymethyl-para-phenylenediamine, N,N-dimethyl-3- methyl-para-phenylenediamine, N-ethyl-N-^-hydroxyethyl)-para-phenylenediamine, N-(b ,y-dihydroxypropyl)-para-phenylenediamine, N-(4’ -aminophenyl) -para- phenylenediamine, N-phenyl-para-phenylenediamine, 2- b - h ydro x yet h y 1 o x y- para- phenylenediamine, 2-b-acetylaminoethyloxy-para-phenylenediamine, N-(b- methoxyethyl)-para-phenylenediamine, 4-aminophenylpyrrolidine, 2-thienyl-para- phenylenediamine, 2-b-hydroxyethylamino-5-aminotoluene and 3 -hydroxy- 1- (4’- aminopheny pyrrolidine, and the corresponding addition salts with an acid.

Among the para-phenylenediamines mentioned above, para- phenylenediamine, para-toluenediamine, 2-isopropyl-para-phenylenediamine, 2-b- hydroxyethyl-para-phenylenediamine, 2- b -hydroxyethyloxy-para-phenylenediamine, 2,6-dimethyl-para-phenylenediamine, 2,6-diethyl-para-phenylenediamine, 2,3- dimethyl-para-phenylenediamine, N,N-bis(b-hydroxyethyl)-para-phenylenediamine, 2-chloro-para-phenylenediamine and 2^-acetylaminoethyloxy-para- phenylenediamine, and the corresponding addition salts with an acid, are particularly preferred.

Among the bis(phenyl)alkylenediamines that may be mentioned, for example, are N,N'-bis^-hydroxyethyl)-N,N'-bis(4'-aminophenyl)-l,3-diaminopropanol, N,N'- bis^-hydroxyethyl)-N,N'-bis(4'-aminophenyl)ethylenediamine, N,N'-bis(4- aminophenyl)tetramethylenediamine, N,N'-bis^-hydroxyethyl)-N,N'-bis(4- aminophenyl)tetramethylenediamine, N,N'-bis(4- methylaminophenyl)tetramethylenediamine, N,N'-bis(ethyl)-N,N'-bis(4'-amino-3'- methylphenyl)ethylenediamine and l,8-bis(2,5-diaminophenoxy)-3,6-dioxaoctane, and the corresponding addition salts.

Among the para-aminophenols that are mentioned are, for example, para- aminophenol, 4-amino-3-methylphenol, 4-amino-3-fluorophenol, 4-amino-3- chlorophenol, 4-amino-3-hydroxymethylphenol, 4-amino-2-methylphenol, 4-amino- 2-hydroxymethylphenol, 4-amino-2-methoxymethylphenol, 4-amino-2- aminomethylphenol, 4-amino-2-(b-hydroxyethyl-aminomethyl)phenol and 4-amino- 2-fluorophenol, and the corresponding addition salts with an acid.

Among the ortho-aminophenols that may be mentioned, for example, are 2- aminophenol, 2-amino-5-methylphenol, 2-amino-6-methylphenol and 5-acetamido-2- aminophenol, and the corresponding addition salts. Among the heterocyclic bases that may be mentioned, for example, are pyridine, pyrimidine and pyrazole derivatives.

Among the pyridine derivatives that may be mentioned are the compounds described, for example, in patents GB 1 026 978 and GB 1 153 196, for example 2,5- diaminopyridine, 2-(4-methoxyphenyl)amino-3-aminopyridine and 3,4- diaminopyridine, and the corresponding addition salts.

Other pyridine oxidation bases that are useful in the present invention are the

3-aminopyrazolo[l,5-a]pyridine oxidation bases or the corresponding addition salts described, for example, in patent application FR 2 801 308. Examples that may be mentioned include pyrazolo[l,5-a]pyrid-3-ylamine, 2-acetylaminopyrazolo[l,5- a]pyrid-3-ylamine, 2-(morpholin-4-yl)pyrazolo[l,5-a]pyrid-3-ylamine, 3- aminopyrazolo[l,5-a]pyridine-2-carboxylic acid, 2-methoxypyrazolo[l,5-a]pyrid-3- ylamine, (3-aminopyrazolo[l,5-a]pyrid-7-yl)methanol, 2-(3-aminopyrazolo[l,5- a]pyrid-5-yl)ethanol, 2-(3-aminopyrazolo[l,5-a]pyrid-7-yl)ethanol, (3- aminopyrazolo[l,5-a]pyrid-2-yl)methanol, 3,6-diaminopyrazolo[l,5-a]pyridine, 3,4- diaminopyrazolo[l,5-a]pyridine, pyrazolo[l,5-a]pyridine-3, 7-diamine, 7-(morpholin-

4-yl)pyrazolo[l,5-a]pyrid-3-ylamine, pyrazolo[l,5-a]pyridine-3, 5-diamine, 5-

(morpholin-4-yl)pyrazolo[l,5-a]pyrid-3-ylamine, 2-[(3-aminopyrazolo[l,5-a]pyrid-5- yl)(2-hydroxyethyl)amino]ethanol, 2-[(3-aminopyrazolo[l,5-a]pyrid-7-yl)(2- hydroxyethyl)amino] ethanol, 3-aminopyrazolo[l,5-a]pyridin-5-ol, 3- aminopyrazolo[l,5-a]pyridin-4-ol, 3-aminopyrazolo[l,5-a]pyridin-6-ol, 3- aminopyrazolo[l,5-a]pyridin-7-ol, 2 - b - h y dro x y ct h o x y - 3 - a m i n o p y razo 1 o [ 1 , 5 - a]pyridine and 2-(4-dimethylpiperazinium- l-yl)-3-aminopyrazolo[l,5-a]pyridine, and the corresponding addition salts.

More particularly, the oxidation bases that are useful in the present invention are chosen from 3-aminopyrazolo[l,5-a]pyridines and are preferably substituted on carbon atom 2 with:

a) a (di)(Ci-C₆)(alkyl)amino group, said alkyl group possibly being substituted with at least one hydroxyl, amino or imidazolium group;

b) an optionally cationic 5- to 7-membered heterocycloalkyl group comprising from 1 to 3 heteroatoms, optionally substituted with one or more (Ci- C₆) alkyl groups such as a di(Ci-C4)alkylpiperazinium group; or

c) a (Ci-C₆)alkoxy group optionally substituted with one or more hydroxyl groups, such as a b-hydroxyalkoxy group, and the corresponding addition salts. Among the 3-aminopyrazolo[l,5-a]pyridine bases, it will in particular be preferred to use 2[(3-aminopyrazolo[l,5-a]pyridin-2-yl)oxy]ethanol, and/or 4-(3- aminopyrazolo[l,5-a]pyridin-2-yl)-l,l-dimethylpiperazin-l-ium chloride and/or the corresponding addition salts or solvates thereof.

Among the pyrimidine derivatives that may be mentioned are the compounds described, for example, in patents DE 2359399; JP 88-169571; JP 05-63124; EP 0770375 or patent application WO 96/15765, such as 2,4,5,6-tetraaminopyrimidine, 4- hydroxy-2,5,6-triaminopyrimidine, 2-hydroxy-4,5,6-triaminopyrimidine, 2,4- dihydroxy-5,6-diaminopyrimidine, 2,5,6-triaminopyrimidine and the addition salts thereof and the tautomeric forms thereof, when a tautomeric equilibrium exists.

Among the pyrazole derivatives that may be mentioned are the compounds described in patents DE 3843892 and DE 4133957 and patent applications WO 94/08969, WO 94/08970, FR-A-2 733 749 and DE 195 43 988, for instance 4,5- diamino- 1-methylpyrazole, 4,5-diamino- l-( -hydroxyethyl)pyrazole, 3,4- diaminopyrazole, 4,5-diamino- l-(4'-chlorobenzyl)pyrazole, 4,5-diamino- 1,3- dimethylpyrazole, 4,5-diamino-3-methyl- 1-phenylpyrazole, 4,5-diamino- l-methyl-3- phenylpyrazole, 4-amino- l,3-dimethyl-5-hydrazinopyrazole, 1 -benzyl-4, 5-diamino-3- methylpyrazole, 4, 5-diamino-3-tert-butyl- 1-methylpyrazole, 4,5-diamino- 1-tert-butyl- 3-methylpyrazole, 4,5-diamino- l-( -hydroxyethyl)-3-methylpyrazole, 4,5-diamino- 1- ethyl-3-methylpyrazole, 4,5-diamino- 1 -ethyl-3 -(4'-methoxyphenyl)pyrazole, 4,5- diamino- 1 -ethyl-3 -hydroxymethylpyrazole, 4,5-diamino-3-hydroxymethyl-l- methylpyrazole, 4,5-diamino-3-hydroxymethyl- 1 -isoprop yip yrazole, 4,5-diamino-3- methyl-1 -isoprop yip yrazole, 4-amino-5-(2'-aminoethyl)amino-l,3-dimethylpyrazole,

3.4.5-triaminopyrazole, l-methyl-3,4,5-triaminopyrazole, 3, 5-diamino- l-methyl-4- methylaminopyrazole and 3, 5-diamino-4-( -hydroxyethyl)amino- 1-methylpyrazole, and the corresponding addition salts. ETse may also be made of 4,5-diamino- 1-(b- methoxyethyl)pyrazole.

A 4,5-diaminopyrazole will preferably be used and even more preferentially

4.5-diamino- 1 -( -hydroxycthyljpyrazolc and/or a corresponding salt.

The pyrazole derivatives that may also be mentioned include diamino-N,N- dihydropyrazolopyrazolones and in particular those described in patent application FR- A-2 886 136, such as the following compounds and the corresponding addition salts: 2, 3-diamino-6, 7-dihydro- lH,5H-pyrazolo[l,2-a]pyrazol-l-one, 2-amino-3- ethylamino-6, 7 -dihydro- lH,5H-pyrazolo[l,2-a]pyrazol-l-one, 2-amino-3- isopropylamino-6, 7-dihydro- lH,5H-pyrazolo[l,2-a]pyrazol-l-one, 2-amino-3-

(pyrrolidin-l-yl)-6, 7-dihydro- lH,5H-pyrazolo[l,2-a]pyrazol-l-one, 4, 5-diamino- 1,2- dimethyl- 1 ,2-dihydropyrazol-3-one, 4,5-diamino- 1 ,2-diethyl- 1 ,2-dihydropyrazol-3- one, 4, 5-diamino- l,2-bis(2-hydroxyethyl)-l,2-dihydropyrazol-3-one, 2-amino-3-(2- hydroxyethyl)amino-6, 7-dihydro- lH,5H-pyrazolo[l,2-a]pyrazol-l-one, 2-amino-3- dimethylamino-6, 7-dihydro- lH,5H-pyrazolo[l,2-a]pyrazol-l-one, 2,3-diamino- 5,6,7,8-tetrahydro-lH,6H-pyridazino[l,2-a]pyrazol-l-one, 4-amino- l,2-diethyl-5- (pyrrolidin-l-yl)-l,2-dihydropyrazol-3-one, 4-amino-5-(3-dimethylaminopyrrolidin- 1-yl)- 1, 2-diethyl- 1,2-dihy drop yrazol-3 -one and 2,3-diamino-6-hydroxy-6,7-dihydro- lH,5H-pyrazolo[ 1 ,2-a]pyrazol- 1 -one.

Use will preferably be made of 2, 3-diamino-6, 7-dihydro- 1H,5H- pyrazolo[l,2-a]pyrazol-l-one and/or a corresponding salt.

Use will preferably be made of 4,5-diamino- l-( -hydroxyethyl)pyrazole and/or 2,3-diamino-6,7-dihydro-lH,5H-pyrazolo[l,2-a]pyrazol-l-one and/or 2[(3- aminopyrazolo [ 1 ,5-a]pyridin-2-yl)oxy] ethanol and/or 4- (3 -aminopyrazolo [1,5- a]pyridin-2-yl)-l,l-dimethylpiperazin-l-ium chloride and/or the corresponding salts or solvates thereof as heterocyclic bases.

In general, the addition salts of oxidation bases that may be used in the composition according to the invention are chosen in particular from the addition salts with an acid such as the hydrochlorides, hydrobromides, sulfates, citrates, succinates, tartrates, lactates, tosylates, benzenesulfonates, phosphates and acetates.

Moreover, the solvates of the oxidation bases more particularly represent the hydrates of said bases and/or the combination of said bases with a linear or branched Ci to C4 alcohol such as methanol, ethanol, isopropanol or n-propanol. Preferably, the solvates are hydrates.

Preferably, the oxidation base(s) are chosen from para-phenylenediamines, bis(phenyl)alkylenediamines, para-aminophenols, bis-para-aminophenols, ortho- aminophenols and heterocyclic bases, the addition salts thereof, the solvates thereof, and mixtures thereof.

More preferentially, the oxidation base(s) are chosen from para- phenylenediamines, and in particular para-toluenediamine, the addition salts thereof, the solvates thereof, and mixtures thereof.

The total amount of oxidation base(s), when they are present in the solid composition according to the present invention, preferably ranges from 0.001% to 20% by weight, more preferentially from 0.01% to 10% by weight, and better still from 0.1% to 7% by weight, relative to the total weight of the solid composition.

Chemical oxidizing agents

The composition according to the invention may also comprise one or more chemical oxidizing agents.

The term "chemical oxidizing agent" is intended according to the invention to mean an oxidizing agent other than atmospheric oxygen.

The chemical oxidizing agent(s) are preferably anhydrous and solid, that is to say in the form of a powder, of a paste or of particles (such as balls).

More particularly, the chemical oxidizing agent(s) are chosen from (i) peroxygenated salts, for instance persulfates, perborates, percarbonates of alkali metals or alkaline-earth metals, such as sodium carbonate peroxide, also known as sodium percarbonate, and peracids and precursors thereof; (ii) alkali metal bromates or ferricyanides; (iii) solid hydrogen peroxide-generating chemical oxidizing agents such as urea peroxide and polymer complexes that can release hydrogen peroxide, especially those comprising a heterocyclic vinyl monomer such as polyvinylpyrrolidone/HiC complexes, in particular in powder form, different than the polymer comprising at least one heterocyclic vinyl monomer (c), as defined below; (iv) oxidases that produce hydrogen peroxide in the presence of a suitable substrate (for example glucose in the case of glucose oxidase or uric acid with uricase); and mixtures thereof.

According to one embodiment, the chemical oxidizing agent(s) are chosen from complexes of hydrogen peroxide and of polymer containing as monomer at least one heterocyclic vinyl monomer different from the polymer comprising at least one heterocyclic vinyl monomer (c) as defined below.

More particularly, the heterocyclic vinyl monomer is chosen from monomers comprising a 4- to 6-membered heterocycle, optionally fused to a benzene ring and comprising from 1 to 4 identical or different intracyclic heteroatoms; the number of intracyclic heteroatoms being less than the number of ring members of the heterocycle. Preferably, the number of intracyclic heteroatoms is 1 or 2.

More particularly, the heteroatom(s) are chosen from sulfur, oxygen and nitrogen, preferably from nitrogen and oxygen. In accordance with an even more advantageous embodiment of the invention, the monomer comprises at least one intracyclic nitrogen atom. The vinyl heterocycle may optionally be substituted with one or more Ci to C4 and preferably Ci to C2 alkyl groups.

Preferably, the heterocyclic monomer is chosen from N-vinyl monomers.

Among the monomers that may be envisaged, mention may be made of the following optionally substituted monomers: N-vinylpyrrolidone, vinylcaprolactam, N- vinylpiperidone, N-vinyl-3 -morpholine, N-vinyl-4-oxazolinone, 2-vinylpyridine, 4- vinylpyridine, 2-vinylquinoline, 1-vinylimidazole and 1-vinylcarbazole. Preferably, the monomer is optionally substituted N-vinylpyrrolidine.

In accordance with one particularly advantageous embodiment of the invention, the polymer is a homopolymer.

However, it is not excluded to use a copolymer. In such a case, the comonomer(s) are chosen from vinyl acetate, (meth)acrylic acids, (meth)acrylamides and Ci to C4 alkyl esters of (meth)acrylic acid, which may be substituted or unsubstituted.

The polymer participating in this complex is preferably water-soluble. It may have variable average molecular weights, preferably between 10³ and 3xl0⁶ g/mol and more preferentially between 10³ and 2xl0⁶ g/mol. It is also possible to use mixtures of such polymers.

Advantageously, said complex comprises from 10% to 30% by weight, preferably from 13% to 25% by weight and more preferentially from 18% to 22% by weight of hydrogen peroxide relative to the total weight of the complex.

According to an even more advantageous variant of the invention, in this complex, the mole ratio between the heterocyclic vinyl monomer(s) and the hydrogen peroxide ranges from 0.5 to 2 and preferably from 0.5 to 1.

This complex is advantageously in the form of a substantially anhydrous powder.

Complexes of this type are especially described in US 5 008 106, US 5 077 047, EP 832 846, EP 714 919, DE 4344131 and DE 195 45 380 and the other polymer complexes described in US 5 008 093, US 3 376 110 and US 5 183 901.

Examples of complexes that may be mentioned include products such as Peroxydone K-30, Peroxydone K-90 and Peroxydone XL- 10 and also complexes formed with hydrogen peroxide and one of the following polymers such as Plasdone K-17, Plasdone K-25, Plasdone K-29/32, Plasdone K-90, Polyplasdone INF- 10, Polyplasdone XL- 10, Polyplasdone XL, Plasdone S-630, Styleze 2000 Terpolymer and the series of Ganex copolymers, sold by the company ISP.

According to one particularly preferred embodiment, the solid composition according to the present invention comprises one or more chemical oxidizing agents chosen from alkali metal percarbonates, alkaline-earth metal percarbonates and mixtures thereof.

Preferably, the chemical oxidizing agent is sodium percarbonate.

The total amount of chemical oxidizing agent(s), when they are present in the solid composition according to the present invention, preferably ranges from 30% to 55% by weight and more preferably from 35% to 50% by weight, relative to the total weight of the solid composition.

Phospholipids

The solid composition according to the invention also comprises one or more phospholipids.

The phospholipids used in the composition according to the invention may be of plant or animal origin and may be in pure form or in the form of a mixture.

Preferably, the phospholipids are phospholipids of plant origin.

The phospholipids used in the composition can in particular be lecithins, which are a complex mixture of phosphatides mainly chosen from phosphatidic acid, phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, lysophosphatidylcholine and/or phosphatidylinositol, in combination with variable amounts of other substances, such as triglycerides, glycolipids, sphingolipids, fatty acids and carbohydrates.

It will thus be possible to choose either the phospholipids mentioned above or the lecithins comprising these phospholipids.

The composition according to the invention comprises at least one phospholipid preferably chosen from lecithins.

The lecithins that can be used according to the present invention may be hydrogenated or nonhydrogenated.

Nonhydrogenated lecithins are generally obtained by lipid extraction, using nonpolar solvents, from plant or animal fatty substances. This lipid fraction usually predominantly comprises glycerophospholipids, including phosphatidylcholine. The animal or plant sources that may be used to extract nonhydrogenated lecithins are, for example, soybean, sunflower or eggs. The glycerophospholipids included, in high proportion, in these lecithins are mainly phosphatidylcholine and pho sphatidylethanolamine .

Preferably, the lecithins are lecithins of plant origin.

The nonhydrogenated lecithins that are suitable for implementation of the present invention may be lecithins derived from soybean, from sunflower or from egg and/or mixtures thereof.

The lecithins are usually provided in a form dissolved in fatty acids, triglycerides or other solvents, or in the form of powders or cakes.

They are usually mixtures of lecithins, the content of glycerophospholipids of which, in the products as marketed, generally ranges from about at least 15% to about at least 95%.

Among the nonhydrogenated lecithins that may be suitable for the use of the cosmetic compositions in accordance with the present invention, mention may be made of the lecithins sold under the references Nattermann Phospholipid®, Phospholipon 80® and Phosale 75® by the company American Lecithin Company, Epikuron 145V, Topcithin 300, Emulmetik 930, Ovothin 200 and Organic Lecithin sold by the company Lucas Meyer, Lipoid S 20 sold by the company Lipoid Kosmetik, and Alcolec L 100 by the company American Lecithin Company.

The phospholipids may be chosen from hydrogenated lecithins.

These hydrogenated lecithins are obtained by controlled hydrogenation of the nonhydrogenated lecithins as described above.

Mention may be made, as hydrogenated lecithins which can be used in the composition according to the invention, for example, of that which is sold under the reference Nikkol Lecinol S 10 by Nikko.

Preferably, the solid composition according to the invention comprises one or more lecithins, preferentially one or more lecithins of plant origin, better still the composition according to the invention comprises a soybean lecithin, even better still a nonhydrogenated soybean lecithin.

The phospholipid(s) are present in a total content ranging from 5% to 30% by weight relative to the total weight of the solid composition. Preferably, the phospholipid(s) may be present in a total content ranging from 5% to 25% by weight, better still from 10% to 20% by weight, relative to the total weight of the solid composition.

The lecithin(s), and in particular the soybean lecithin, may be present in a total content ranging from 5% to 30% by weight relative to the total weight of the solid composition, better still from 5% to 25% by weight, even better still from 10% to 20% by weight, relative to the total weight of the solid composition.

Oxidation couplers

The solid composition according to the present invention can optionally also comprise one or more oxidation couplers conventionally used for dyeing keratin fibers.

Among these oxidation couplers, mention may be made in particular of meta- phenylenediamines, meta-aminophenols, meta-diphenols, naphthalene-based couplers and heterocyclic couplers, the addition salts thereof, the solvates thereof, and mixtures thereof.

Examples that may be mentioned include resorcinol, 2-methyl-5- hydroxyethylaminophenol, 2,4-diaminophenoxyethanol, 1,3-dihydroxybenzene, 1,3- dihydroxy-2-methylbenzene, 4-chloro- 1,3-dihydroxybenzene, 2,4-diamino- 1-(b- hydroxyethyloxy)benzene, 2-amino-4-(P-hydroxyethylamino)-l-methoxybenzene, 1,3-diaminobenzene, l,3-bis(2,4-diaminophenoxy)propane, 3-ureidoaniline, 3-ureido- 1-dimethylaminobenzene, sesamol, 1 -b-hyd ro x y c t h y 1 a m i n o - 3 , 4 - methylenedioxybenzene, a-naphthol, 2-methyl- 1-naphthol, 6-hydroxyindole, 4- hydroxyindole, 4-hydroxy-N-methylindole, 2-amino-3-hydroxypyridine, 6- hydroxybenzomorpholine, 3,5-diamino-2,6-dimethoxypyridine, 1-N-(b- hydroxyethyl)amino-3,4-methylenedioxybenzene, 2,6-bis^- hydroxyethylamino)toluene, 6-hydroxyindoline, 2,6-dihydroxy-4-methylpyridine, 1- H-3-methylpyrazol-5-one, l-phenyl-3-methylpyrazol-5-one, 2,6- dimethylpyrazolo[l,5-b]-l, 2, 4-triazole, 2, 6-dimethyl[3,2-c]- 1,2,4-triazole and 6- methylpyrazolo[l,5-a]benzimidazole, 2-methyl-5-aminophenol, 5-N-(b- hydroxyethyl)amino-2-methylphenol, 3-aminophenol (or meta-aminophenol) and 3- amino-2-chloro-6-methylphenol, the corresponding addition salts with an acid and the corresponding mixtures.

Preferably, the coupler(s) are chosen from meta-phenylenediamines, meta- aminophenols, the addition salts thereof, and mixtures thereof, and more preferentially from 2,4-diaminophenoxyethanol, resorcinol, meta-aminophenol, the addition salts thereof, the solvates thereof, and mixtures thereof.

The addition salts of the oxidation couplers optionally present in the composition according to the invention are chosen especially from the addition salts with an acid, such as the hydrochlorides, hydrobromides, sulfates, citrates, succinates, tartrates, lactates, tosylates, benzenesulfonates, phosphates and acetates, and the addition salts with a base such as sodium hydroxide, potassium hydroxide, ammonia, amines or alkanolamines.

Moreover, the solvates of the oxidation couplers more particularly represent the hydrates of said couplers and/or the combination of said couplers with a linear or branched Ci to C4 alcohol such as methanol, ethanol, isopropanol or n-propanol. Preferably, the solvates are hydrates.

The total amount of the oxidation coupler(s), when they are present in the solid composition according to the invention, preferably ranges from 0.001% to 20% by weight, more preferentially from 0.01% to 10% by weight, and better still from 0.1% to 7% by weight, relative to the total weight of the solid composition.

Alkaline agents

The solid composition according to the present invention may optionally also comprise one or more alkaline agents.

The alkaline agent(s) can be chosen from silicates and metasilicates such as alkali metal metasilicates, carbonates or hydrogen carbonates of alkali metals or alkaline-earth metals, such as lithium, sodium, potassium, magnesium, calcium or barium, and mixtures thereof.

The alkaline agent(s) can also be chosen from ammonium salts, and in particular inorganic ammonium salts.

Preferably, the ammonium salt(s) are chosen from ammonium halides, such as ammonium chloride, ammonium sulfate, ammonium phosphate, ammonium nitrate and mixtures thereof.

More preferentially, the ammonium salt is ammonium chloride or ammonium sulfate.

In one preferred embodiment, the solid composition according to the present invention comprises one or more alkaline agents. Even more preferentially, the solid composition according to the present invention comprises one or more ammonium salts, preferably chosen from ammonium chloride or ammonium sulfate, better still ammonium sulfate.

The total amount of the alkaline agent(s), when they are present in the solid composition according to the invention, preferably ranges from 0.1% to 15% by weight, more preferentially from 1% to 10% by weight, and better still from 2% to 5% by weight, relative to the total weight of the solid composition.

Thickening polymers

The solid composition according to the present invention may optionally also comprise one or more thickening polymers.

Advantageously, the thickening polymer(s) are chosen from the following polymers:

(a) nonionic amphiphilic polymers comprising at least one fatty chain and at least one hydrophilic unit;

(b) anionic amphiphilic polymers comprising at least one hydrophilic unit and at least one fatty-chain unit;

(c) crosslinked acrylic acid homopolymers;

(d) crosslinked homopolymers of 2-acrylamido-2-methylpropanesulfonic acid, and crosslinked acrylamide copolymers thereof which are partially or totally neutralized;

(e) ammonium acrylate homopolymers or copolymers of ammonium acrylate and of acrylamide;

(f) dimethylaminoethyl methacrylate homopolymers quaternized with methyl chloride or dimethylaminoethyl methacrylate copolymers quaternized with methyl chloride and of acrylamide; and

(g) polysaccharides such as:

(gl) scleroglucan gums (biopolysaccharide of microbial origin);

(g2) gums derived from plant exudates, such as gum arabic, ghatti gum, karaya gum or gum tragacanth;

(g3) celluloses and derivatives;

(g4) guar gums and derivatives; or

(g5) starches or derivatives.

It should be noted that, in the case of the present invention, the thickening polymers act on the viscosity of the ready-to-use composition, that is to say of the composition comprising the solid composition according to the present invention and a cosmetically acceptable medium.

According to the invention, amphiphilic polymers are more particularly hydrophilic polymers that are capable, in the medium of the composition, and more particularly in an aqueous medium, of reversibly combining with each other or with other molecules.

Their chemical structure more particularly comprises at least one hydrophilic region and at least one hydrophobic region. The term "hydrophobic group" is intended to mean a radical or polymer bearing a saturated or unsaturated, linear or branched hydrocarbon-based chain, comprising at least 8 carbon atoms, preferably at least 10 carbon atoms, more preferentially from 10 to 30 carbon atoms, in particular from 12 to 30 carbon atoms and even better still from 18 to 30 carbon atoms. Preferentially, the hydrocarbon-based group is derived from a monofunctional compound. By way of example, the hydrophobic group may be derived from a fatty alcohol such as stearyl alcohol, dodecyl alcohol or decyl alcohol. It may also denote a hydrocarbon-based polymer, for instance polybutadiene.

Preferably, the thickening polymer(s) are chosen from polysaccharides, preferentially from starches or derivatives.

The starch molecules used in the present invention may originate from any plant source of starch, in particular cereals and tubers; more particularly, they may be starches from com, rice, cassava, barley, potato, wheat, sorghum, pea, oat or tapioca. It is also possible to use the hydrolysates of the starches mentioned above. The starch is preferably derived from potato.

The starches can be chemically or physically modified, in particular by one or more of the following reactions: pregelatinization, oxidation, crosslinking, esterification, etherification, amidation or heat treatments.

Distarch phosphates or compounds rich in distarch phosphate will preferentially be used, for instance the product sold under the references Prejel VA- 70-T AGGL (gelatinized hydroxypropyl cassava distarch phosphate), Prejel TK1 (gelatinized cassava distarch phosphate) or Prejel 200 (gelatinized acetyl cassava distarch phosphate) by the company Avebe, or Structure Zea from National Starch (pregelatinized com distarch phosphate). In one preferred embodiment, the solid composition according to the invention comprises one or more thickening polysaccharides, preferably chosen from starches or derivatives.

The total amount of the thickening polymer(s), when they are present in the solid composition according to the invention, preferably ranges from 1% to 40% by weight, more preferentially from 5% to 30% by weight and better still from 10% to 20% by weight, relative to the total weight of the solid composition.

Surfactants

The solid composition according to the present invention can optionally also comprise one or more surfactants, preferably chosen from anionic surfactants, amphoteric or zwitterionic surfactants, nonionic surfactants, cationic surfactants and mixtures thereof.

For the purposes of the present invention, the term "surfactant" is intended to mean an agent comprising at least one hydrophilic group and at least one lipophilic group in its structure, and which is preferably capable of reducing the surface tension of water, and comprising in its structure, as optional repeating units, only alkylene oxide units and/or sugar units and/or siloxane units. Preferably, the lipophilic group is a fatty chain comprising from 8 to 30 carbon atoms.

When the composition comprises one or more surfactants, the solid composition according to the present invention preferably comprises one or more surfactants chosen from anionic surfactants.

The term "anionic surfactant" is intended to mean a surfactant including, as ionic or ionizable groups, only anionic groups. These anionic groups are preferably chosen from the following groups: -C(0)OH, -C(0)0-, -SO₃H, -S(0)₂0 , 0S(0)₂0H, -OS(0)₂cr, -P(0)OH₂, -P(0)₂cr, -P(0)0₂-, -P(0H)₂, =P(0)OH, -P(OH)CT, =P(0)CT, =POH, =PO ; the anionic parts comprising a cationic counterion such as those of an alkali metal, an alkaline-earth metal or of an amine or of an ammonium.

As examples of anionic surfactants that may be used in the composition according to the invention, mention may be made of alkyl sulfates, alkyl ether sulfates, alkylamido ether sulfates, alkylaryl polyether sulfates, monoglyceride sulfates, alkyl sulfonates, alkylamidesulfonates, alkyl aryl sulfonates, a-olefin sulfonates, paraffin sulfonates, alkyl sulfosuccinates, alkyl ether sulfosuccinates, alkylamide sulfosuccinates, alkyl sulfoacetates, acylsarcosinates, acylglutamates, alkyl sulfosuccinamates, acylisethionates and N-acyltaurates, polyglycoside -polycarboxylic acid and alkyl monoester salts, acyl lactylates, salts of D-galactoside uronic acids, salts of alkyl ether carboxylic acids, salts of alkylaryl ether carboxylic acids, salts of alkylamido ether carboxylic acids; and the corresponding non-salified forms of all these compounds; the alkyl and acyl groups of all these compounds comprising from 6 to 24 carbon atoms and the aryl group denoting a phenyl group.

These compounds may be oxyethylenated and then preferably comprise from 1 to 50 ethylene oxide units.

The salts of Ce to C24 alkyl monoesters of polyglycoside -polycarboxylic acids may be chosen from Ce to C24 alkyl polyglycoside-citrates, Ce to C24 alkyl polyglycoside-tartrates and Ce to C24 alkyl polyglycoside-sulfosuccinates.

When the anionic surfactant(s) are in salt form, they may be chosen from alkali metal salts such as the sodium or potassium salt and preferably the sodium salt, ammonium salts, amine salts and in particular amino alcohol salts or alkaline-earth metal salts such as the magnesium salts.

Examples of amino alcohol salts that may in particular be mentioned include monoethanolamine, diethanolamine and triethanolamine salts, monoisopropanolamine, diisopropanolamine or triisopropanolamine salts, 2-amino-2- methyl-1 -propanol salts, 2-amino-2-methyl- 1,3-propanediol salts and tris(hydroxymethyl)aminomethane salts.

Use is preferably made of alkali metal or alkaline-earth metal salts and in particular of sodium or magnesium salts.

Among the anionic surfactants mentioned, use is preferably made of acylisethionates and the corresponding nonsalified forms, the acyl groups comprising from 6 to 24 carbon atoms, or a mixture of these compounds.

The total amount of the surfactant(s), when they are present in the solid composition according to the invention, preferably ranges from 0.05% to 15% by weight, more preferentially from 0.1% to 10% by weight, and better still from 0.75% to 5% by weight, relative to the total weight of the solid composition.

Additives

The solid composition according to the present invention may also optionally comprise one or more additives, different from the compounds of the invention and among which mention may be made of cationic, anionic, nonionic or amphoteric polymers or mixtures thereof different from the thickening polymers described previously, antidandruff agents, anti-seborrhoea agents, agents for preventing hair loss and/or for promoting hair regrowth, vitamins and provitamins including panthenol, sunscreens, mineral or organic pigments, sequestrants, plasticizers, solubilizers, acidifying agents, mineral thickeners, opacifiers or nacreous agents, antioxidants, reducing agents hydroxy acids, fragrances, preserving agents, pigments and ceramides.

Needless to say, those skilled in the art will take care to select this or these optional additional compound(s) such that the advantageous properties intrinsically associated with the solid dyeing or lightening composition according to the invention are not, or are not substantially, adversely affected by the envisaged addition(s).

The above additives may generally be present in an amount, for each of them, of between 0 and 20% by weight relative to the total weight of the solid composition.

Preferably, the solid dyeing or lightening composition according to the invention is anhydrous.

For the purposes of the present invention, the term“anhydrous” is intended to mean that the solid composition comprises less than 5% by weight of water, better still less than 2%, of water relative to the total weight of the solid composition. In particular, the solid composition does not comprise added water, the possible presence of water being linked to the commercial starting materials used.

Ready-to-use composition

The present invention also relates to a ready-to-use composition comprising a solid dyeing or lightening composition, as defined above, and a cosmetically acceptable medium. In other words, the ready-to-use liquid composition results from the mixing of a solid dyeing or lightening composition, as defined previously, and of a cosmetically acceptable liquid medium.

The total amount of oxidation base(s) present in the ready-to-use composition according to the present invention, when it is a dyeing composition, preferably ranges from 0.001% to 15% by weight, and more preferentially from 0.005% to 10% by weight, better still from 0.075% to 7% by weight, relative to the total weight of the ready-to-use composition.

The total amount of chemical oxidizing agent(s) present in the ready-to-use composition according to the invention preferably ranges from 1% to 50% by weight, and more preferentially from 5% to 30% by weight, better still from 8% to 20% by weight, relative to the total weight of the ready-to-use composition.

The total amount of the phospholipid(s) present in the ready-to-use composition according to the invention preferably ranges from 0.1% to 20% by weight, and more preferentially from 0.5% to 10% by weight, better still from 1% to 8% by weight, and even better still from 2,5 to 8% by weight relative to the total weight of the ready-to-use composition.

The total amount of coupler(s), when they are present in the ready-to-use composition according to the invention, preferably ranges from 0.001% to 15% by weight, more preferentially from 0.005% to 10% by weight, better still from 0.075% to 7% by weight, relative to the total weight of the ready-to-use composition.

Cosmetically acceptable liquid medium

The term“cosmetically acceptable medium” is intended to mean, according to the present application, a medium that is compatible with keratin fibers, in particular human keratin fibers such as the hair.

The cosmetically acceptable medium is constituted of water or of a mixture of water and of one or more organic solvents.

Examples of organic solvents that may be mentioned include linear or branched C2 to C4 alkanols, such as ethanol, isopropanol, tert-butanol or n-butanol; glycerol; polyols and polyol ethers, for instance 2-butoxyethanol, propylene glycol, hexylene glycol, dipropylene glycol, propylene glycol monomethyl ether, diethylene glycol monomethyl ether and monoethyl ether, and also aromatic alcohols or ethers, for instance benzyl alcohol or phenoxyethanol, and mixtures thereof.

Preferably, the cosmetically acceptable medium is water.

The mixture ratio (expressed by weight) between the solid composition and the cosmetically acceptable medium is preferably between 10/90 and 90/10 and more preferentially between 10/90 and 50/50, even better still between 20/80 and 30/70.

Packaging article

ii) a solid dyeing or lightening composition as defined previously;

The term "water-soluble" is intended to mean soluble in water, in particular in a proportion of at least 10 grams per litre of water, preferably at least 20 g/1 and better still at least 50 g/1, at a temperature of less than or equal to 35°C.

The term "liposoluble" is intended to mean soluble in a liquid fatty substance as defined below, in particular in a proportion of at least 10 grams per litre of liquid fatty substance, in particular in a plant oil or mineral oil such as liquid petroleum jelly, preferably at least 20 g/1 in a liquid fatty substance, better still at least 50 g/1 in a fatty substance, at a temperature of less than or equal to 35°C.

The term "temperature of less than or equal to 35°C" is intended to mean a temperature not exceeding 35°C but greater than or equal to 0°C, for example ranging from more than 1 to 35°C, better still from 5 to 30°C and even better still from 10 to 30°C or 10 to 20°C. It is understood that all the temperatures are given at atmospheric pressure.

The packaging article according to the invention is preferably water-soluble or liposoluble at a temperature of less than or equal to 35°C.

The packaging article can comprise one or more cavities, at least one of which contains the solid dyeing or lightening composition as defined previously.

The packaging article preferably comprises only one cavity.

The envelope may be constituted of a sheet constituted of water-soluble and/or liposoluble fibers, which is folded on itself, or of a first sheet constituted of water-soluble and/or liposoluble fibers and covered with a second sheet also constituted of water-soluble and/or liposoluble fibers. The sheet folded on itself or the two sheets are then assembled hermetically in such a way that the solid dyeing or lightening composition according to the present invention cannot diffuse to the exterior. The assembling is preferably carried out at the periphery of the sheet(s). Preferably, the heat- welding is performed with entanglement of the fibers of the parts of the envelope to be welded. The solid dyeing or lightening composition is thus hermetically enveloped by the envelope i). The solid dyeing or lightening composition is distinct from the sheet or from the envelope. Such an envelope is different from water-soluble or liposoluble thin films in which the solid dyeing composition would be incorporated in the sheet(s) forming the envelope. Relative to these water-soluble or liposoluble thin films, the envelope according to the invention has the advantage of allowing the incorporation of constituents that are incompatible therewith, and of being simpler to use since it does not require any premixing or any dissolution of the constituents in a solvent, or any heating to evaporate the solvent. The process for manufacturing the packaging article of the invention is also faster and less expensive than the process for manufacturing thin films.

Furthermore, when the active agents, in this case in particular the oxidation bases and the couplers, are used in dispersion to form a thin film, this may give rise to compatibility problems and mechanical problems (breaking of the film) and may impose limits on the concentration of active agents. In addition, the envelope and the sheets that are useful for the invention have the advantage of allowing wider diversity in the choice of the shape and appearance of the article, since the water-soluble and/or liposoluble sheet(s) may have a variable thickness and a variable density, giving access to a wide variety of shapes and sizes, whereas the thin film is difficult to dry if the thickness is too large, and it is fragile and difficult to manipulate if the size is too large.

Advantageously, the envelope or the sheets are "touch-deformable", which in particular means that the envelope and the sheets become deformed when they are held and pinched between a user's fingers.

Preferably, the solid dyeing or lightening composition is present in a cavity generated by at least two sheets constituting the envelope and defining between them a cavity, said sheets preferably comprising water-soluble fibers.

According to a particular embodiment of the invention, at least one of the sheets of the packaging article is constituted exclusively of water-soluble fibers, and more preferentially all the sheets of the packaging article of the invention are constituted exclusively of water-soluble fibers, preferably water-soluble at a temperature of less than or equal to 30°C.

The term "fiber" is intended to mean any object of which the length is greater than its cross section. In other words, it should be understood as meaning an object of length L and of diameter D such that L is greater and preferably very much greater (i.e. at least three times greater) than D, D being the diameter of the circle in which the cross section of the fiber is inscribed. In particular, the ratio L/D (or aspect ratio) is chosen in the range from 3.5 to 2500, preferably from 5 to 500 and better still from 5 to 150. The cross section of a fiber may have any round, toothed or fluted shape, or alternatively a bean shape, but also multilobate, in particular trilobate or pentalobate, X-shaped, ribbon- shaped, square, triangular, elliptical or the like. The fibers of the invention may or may not be hollow. The fibers used according to the present invention may be of natural, synthetic or even artificial origin. Advantageously, said fibers are of synthetic origin.

A "natural fiber" is by definition a fiber that is naturally present in nature, directly or after mechanical and/or physical treatment. Fibers of animal origin, such as cellulose fibers, in particular extracted from wood, leguminous plants or algae, and rayon fibers, are collated in this category.

The "artificial fibers" are either totally synthetic or derived from natural fibers that have been subjected to one or more chemical treatments in order to improve in particular their mechanical and/or physicochemical properties.

The "synthetic fibers" collate fibers obtained by chemical synthesis and are generally fibers constituted of one or more mono -component or multi-component, composite or non-composite polymers and/or copolymers, which are generally extruded and/or drawn to the desired diameter of the fiber.

The fibers of the envelope of the packaging article according to the invention can be constituted of one or more water-soluble polymers.

The water-soluble polymer(s) of the invention contain water-soluble units in their backbones. The water-soluble units are obtained from one or more water-soluble monomers.

The term "water-soluble monomer" is intended to mean a monomer of which the solubility in water is greater than or equal to 1%, preferably greater than or equal to 5%, at 25°C and at atmospheric pressure (760 mmHg).

Said synthetic water-soluble polymer(s) used in the context of the present invention are advantageously obtained from water-soluble monomers comprising at least one double bond. These monomers may be chosen from cationic, anionic and nonionic monomers, and mixtures thereof.

As water-soluble monomers that may be used as precursors of the water- soluble units, alone or as a mixture, examples that may be mentioned include the following monomers, which may be in free or salified form:

- (meth)acrylic acid, - styrenesulfonic acid,

- vinylsulfonic acid and (meth)allylsulfonic acid,

- vinylphosphonic acid,

- N-vinylacetamide and N-methyl-N-vinylacetamide,

- N-vinylformamide and N-methyl-N-vinylformamide,

- N-vinyllactams comprising a cyclic alkyl group containing from 4 to 9 carbon atoms, such as N-vinylpyrrolidone, N-butyrolactam and N-vinylcaprolactam,

- maleic anhydride,

- itaconic acid,

- vinyl alcohol of formula CH2=CHOH,

- vinyl ethers of formula CH2=CHOR in which R is a linear or branched, saturated or unsaturated hydrocarbon-based radical containing from 1 to 6 carbons,

- dimethyldiallylammonium halides (chloride),

- quaternized dimethylaminoethyl methacrylate (DMAEMA),

- (meth)acrylamidopropyltrimethylammonium halides (chloride) (APTAC and MAPTAC),

- methylvinylimidazolium halides (chloride),

- 2-vinylpyridine and 4-vinylpyridine,

- acrylonitrile,

- glycidyl (meth)acrylate,

- vinyl halides (chloride) and vinylidene chloride,

- vinyl monomers; and

- mixtures thereof.

Anionic monomers that may in particular be mentioned include (meth)acrylic acid, acrylamido-2-methylpropanesulfonic acid, itaconic acid and alkali metal, alkaline-earth metal or ammonium salts thereof or salts thereof derived from an organic amine such as an alkanolamine.

Nonionic monomers that may in particular be mentioned include (meth)acrylamide, N-vinylformamide, N-vinylacetamide, hydroxypropyl (meth)acrylate and the vinyl alcohol of formula CH2=CHOH.

Examples of water-soluble cationic monomers that may in particular be mentioned include the following compounds, and also salts thereof: dimethylaminoethyl, (meth)acryloyloxyethyltrimethylammonium,

(meth)acryloyloxyethyldimethylbenzylammonium, N - [dimethylaminopropyl](meth)acrylamide,

(meth)acrylamidopropyltrimethylammonium,

(meth)acrylamidopropyldimethylbenzylammonium, dimethylaminohydroxypropyl, (meth)acryloyloxyhydroxypropyltrimethylammonium,

(meth)acryloyloxyhydroxypropyldimethylbenzylammonium and dimethyldiallylammonium (meth)acrylate.

Preferably, the polymer of use according to the invention is polymerized from at least one cationic monomer as defined above.

As polymers that are particularly preferred in the invention, mention may be made in particular of those polymerized from:

- 10% of acryloyloxyethyldimethylbenzylammonium chloride and 90% of acrylamide,

- 30% of acryloyloxytrimethylammonium chloride, 50% of acryloyloxyethyldimethyl- benzylammonium chloride and 20% of acrylamide,

- 10% of acryloyloxyethyltrimethylammonium chloride and 90% of acrylamide,

- 30% of diallyldimethylammonium chloride and 70% of acrylamide, or

- 30% of acrylic acid and 70% of acrylamide.

According to a particular embodiment, the polymers are polymerized from a cationic monomer and acrylic acid, the number of moles of the cationic monomer being greater than the number of moles of acrylic acid.

As water-soluble polymers derived from natural products, mention may be made of polysaccharides, i.e. polymers bearing sugar units.

The term“sugar unit” is intended to mean a unit resulting from a carbohydrate of formula C_n(H₂0)_n-i or (Ct Ol_n, which can be optionally modified by substitution and/or by oxidation and/or by dehydration. The sugar units that may be included in the composition of the polymers of the invention are preferably derived from the following sugars: glucose, galactose, arabinose, rhamnose, mannose, xylose, fucose, fructose, anhydrogalactose, galacturonic acid, glucuronic acid, mannuronic acid, galactose sulfate or anhydrogalactose sulfate.

The polymers having a sugar unit or sugar units according to the invention can be of natural or synthetic origin. They can be nonionic, anionic, amphoteric or cationic. The base units of the polymers having a sugar unit of the invention can be mono- or disaccharides.

Mention may in particular be made, as polymers capable of being employed, of the following native gums, and also their derivatives: a) tree or shrub exudates, including:

- gum arabic (branched polymer of galactose, arabinose, rhamnose and glucuronic acid);

- ghatti gum (polymer derived from arabinose, galactose, mannose, xylose and glucuronic acid);

- karaya gum (polymer derived from galacturonic acid, galactose, rhamnose and glucuronic acid);

- gum tragacanth (polymer of galacturonic acid, galactose, fucose, xylose and arabinose);

b) gums derived from algae, including:

- agar (polymer derived from galactose and anhydrogalactose);

- alginates (polymers of mannuronic acid and of glucuronic acid);

- carrageenans and furcellerans (polymers of galactose sulfate and of anhydrogalactose sulfate);

c) gums derived from seeds or tubers, including:

- guar gum (polymer of mannose and galactose);

- locust bean gum (polymer of mannose and galactose);

- fenugreek gum (polymer of mannose and galactose);

- tamarind gum (polymer of galactose, xylose and glucose);

- konjac gum (polymer of glucose and mannose) in which the main constituent is glucomannan, a polysaccharide of high molecular weight (500 000 < Mglucomannan< 2 000 000) composed of D-mannose and D-glucose units with a branch every 50 or 60 units approximately;

d) microbial gums, including:

- xanthan gum (polymer of glucose, mannose acetate, mannose/pyruvic acid and glucuronic acid);

- gellan gum (polymer of partially acylated glucose, rhamnose and glucuronic acid);

- scleroglucan gum (glucose polymer);

- biosaccharide gum (polymer of galacturonic acid, fucose and D-galactose), for example the product sold under the name Fucogel 1.5P from Solabia (polysaccharide rich in fucose (20%) at 1.1% in water and stabilized (1.5% phenoxyethanol));

e) plant extracts, including:

- cellulose (glucose polymer);

- starch (glucose polymer); - inulin (polymer of fructose and glucose).

These polymers may be physically or chemically modified. Preferably, these chemical or physical treatments are applied to guar gums, locust bean gums, starches and celluloses.

The nonionic guar gums that may be used according to the invention may be modified with C_\-Ce hydroxyalkyl groups. Mention may be made, among the hydroxyalkyl groups, of the hydroxymethyl, hydroxyethyl, hydroxypropyl and hydroxybutyl groups.

Such nonionic guar gums optionally modified with hydroxyalkyl groups are sold, for example, under the trade names Jaguar HP8, Jaguar HP60 and Jaguar HP120 by the company Rhodia Chimie.

The guar gums modified with cationic groups which can more particularly be used according to the invention are guar gums comprising trialkylammonium cationic groups. Preferably, from 2% to 30% of the number of the hydroxyl functional groups of these guar gums carry trialkylammonium cationic groups. More preferably still, from 5% to 20% of the number of the hydroxyl functional groups of these guar gums are branched with trialkylammonium cationic groups. Mention may very particularly be made, among these trialkylammonium groups, of the trimethylammonium and triethylammonium groups. More preferably still, these groups represent from 5% to 20% by weight, relative to the total weight of the modified guar gum.

According to the invention, use may be made of guar gums modified with 2,3- epoxypropyltrimethylammonium chloride.

These guar gums modified with cationic groups are products already known per se and are, for example, described in Patents US 3 589 578 and US 4 0131 307. Such products are moreover sold especially under the trade names Jaguar C 13 S, Jaguar C 15 and Jaguar C 17 by the company Rhodia Chimie.

Use may be made, as modified locust bean gum, of the cationic locust bean gum containing hydroxypropyltrimonium groups, such as Catinal CLB 200 provided by the company Toho.

The starch molecules used in the present invention may originate from any plant source of starch, in particular cereals and tubers; more particularly, they may be starches from com, rice, cassava, barley, potato, wheat, sorghum, pea, oat or tapioca. It is also possible to use the hydrolysates of the starches mentioned above. The starch is preferably derived from potato. The starches can be chemically or physically modified, in particular by one or more of the following reactions: pregelatinization, oxidation, crosslinking, esterification, etherification, amidation or heat treatments.

Distarch phosphates or compounds rich in distarch phosphate will preferentially be used, for instance the product sold under the references Prejel VA- 70-T AGGL (gelatinized hydroxypropyl cassava distarch phosphate), Prejel TK1 (gelatinized cassava distarch phosphate) or Prejel 200 (gelatinized acetyl cassava distarch phosphate) by the company Avebe, or Structure Zea from National Starch (gelatinized com distarch phosphate).

According to the invention, use may also be made of amphoteric starches comprising one or more anionic groups and one or more cationic groups. The anionic and cationic groups may be bonded to the same reactive site of the starch molecule or to different reactive sites; they are preferably bonded to the same reactive site. The anionic groups can be of carboxylic, phosphate or sulfate type, preferably of carboxylic type. The cationic groups may be of primary, secondary, tertiary or quaternary amine type.

The preferred amphoteric starch is a starch chloroethylamidodipropionate.

The celluloses and cellulose derivatives can be anionic, cationic, amphoteric or nonionic.

Among these derivatives, cellulose ethers, cellulose esters and cellulose ester ethers are distinguished.

Among the cellulose esters, mention may be made of inorganic cellulose esters (cellulose nitrates, sulfates and phosphates), organic cellulose esters (cellulose monoacetates, triacetates, amidopropionates, acetate butyrates, acetate propionates and acetate trimellitates), and mixed organic/inorganic cellulose esters, such as cellulose acetate butyrate sulfates and cellulose acetate propionate sulfates.

Mention may be made, among the cellulose ester ethers, of hydroxypropyl methylcellulose phthalates and ethylcellulose sulfates.

Mention may be made, among the nonionic cellulose ethers, of alkylcelluloses, such as methylcelluloses and ethylcelluloses (for example Ethocel Standard 100 Premium from Dow Chemical); hydroxyalkylcelluloses, such as hydroxymethylcelluloses and hydroxyethylcelluloses (for example Natrosol 250 HHR provided by Aqualon) and hydroxypropylcelluloses (for example Klucel EF from Aqualon); and mixed hydroxyalkyl alkylcelluloses, such as hydroxypropyl methylcelluloses (for example Methocel E4M from Dow Chemical), hydroxyethyl methylcelluloses, hydroxyethyl ethylcelluloses (for example Bermocoll E 481 FQ from Akzo Nobel) and hydroxybutyl methylcelluloses.

Among the anionic cellulose ethers, mention may be made of carboxyalkylcelluloses and salts thereof. Examples that may be mentioned include carboxymethyl celluloses, carboxymethyl methyl celluloses (for example Blanose 7M from the company Aqualon) and carboxymethyl hydroxyethyl celluloses, and also the sodium salts thereof.

Among the cationic cellulose ethers, mention may be made of crosslinked or non-crosslinked quaternized hydroxyethylcelluloses. The quaternizing agent can in particular be diallyldimethylammonium chloride (for example Celquat L200 from National Starch). Mention may be made, as other cationic cellulose ether, of hydroxyethylcellulose hydroxypropyltrimethylammonium (for example ETcare polymer JR 400 from Amerchol).

Among the associative polymers bearing a sugar unit or sugar units, mention may be made of celluloses or derivatives thereof, modified with groups comprising at least one fatty chain, such as alkyl, arylalkyl or alkylaryl groups or mixtures thereof in which the alkyl groups are of Cs-Cn; nonionic alkylhydroxyethylcelluloses such as the products Natrosol Plus Grade 330 CS and Polysurf 67 (Ci₆ alkyl) sold by the company Aqualon; (cationic) quaternized alkylhydroxyethylcelluloses, such as the products Quatrisoft LM 200, Quatrisoft LM-X 529-18-A, Quatrisoft LM-X 529-18-B (C12 alkyl) and Quatrisoft LM-X 529-8 (Cis alkyl) sold by the company Amerchol, the products Crodacel QM and Crodacel QL (C12 alkyl) and Crodacel QS (Cis alkyl) sold by the company Croda, and the product Softcat SL 100 sold by the company Amerchol; nonionic nonoxynylhydroxyethylcelluloses such as the product Amercell HM-1500 sold by the company Amerchol; nonionic alkylcelluloses such as the product Bermocoll EHM 100 sold by the company Berol Nobel.

As associative polymers bearing a sugar unit or sugar units derived from guar, mention may be made of hydroxypropyl guars modified with a fatty chain, such as the product Esaflor HM 22 (modified with a C22 alkyl chain) sold by the company Lamberti; the product Miracare XC 95-3 (modified with a C14 alkyl chain) and the product RE 205-146 (modified with a C20 alkyl chain) sold by Rhodia Chimie. The polymer(s) bearing a sugar unit or sugar units of the invention are preferably chosen from guar gums, locust bean gums, xanthan gums, starches and celluloses, in their modified form (derivatives) or unmodified form.

Preferably, the polymers bearing a sugar unit or sugar units according to the invention are nonionic.

More preferably, the polymer(s) bearing a sugar unit or sugar units of the invention are chosen from modified nonionic guar gums, especially modified with Ci to Ce hydroxyalkyl groups.

Mention may be made more particularly of water-soluble fibers that include fibers based on polyvinyl alcohol, fibers of polysaccharides such as glucomannans, starches or celluloses, in particular wood extract, polyalginic acid fibers, polylactic acid fibers and polyalkylene oxide fibers, and also mixtures thereof.

More preferentially, the water-soluble fiber(s) used in the invention are chosen from cellulose fibers, and in particular cellulose fibers extracted from wood.

In addition, the envelope and the sheets of the invention may be woven or nonwoven.

According to a particular embodiment, the envelope and the sheets of the invention are woven. In the context of the present invention, a "woven" material results from an organized assembly of fibers, in particular of water-soluble polymeric fibers, and more particularly of an intercrossing, in the same plane, of said fibers, arranged in the warp direction and of fibers arranged, perpendicular to the warp fibers, in the weft direction. The binding obtained between these warp and weft fibers is defined by a weave.

More particularly, the two layers or sheets comprising the woven polymeric water-soluble fibers that constitute the envelope of the packaging article of the invention do not comprise any other additional layer superposed thereon.

According to another particularly advantageous mode of the invention, the envelope and the sheets are nonwoven.

For the purposes of the present invention, the expression "nonwoven" is intended to mean a substrate comprising fibers, in particular water-soluble fibers, in which substrate the individual fibers are arranged in a disordered manner in a structure in the form of a sheet and which are neither woven nor knitted. The fibers of the nonwoven are generally bonded together, either under the effect of a mechanical action (for example needle punching, air jet, water jet, etc.), or under the effect of a thermal action, or by addition of a binder.

Very preferentially, the envelope and sheets of the invention are nonwovens, and preferentially made of nonwoven cellulose fibers extracted from wood.

The sheets of the envelope may comprise a mixture of different fibers that are soluble in water at various temperatures (up to 35°C).

Preferably, the nonwoven is constituted essentially of water-soluble fibers, i.e. it does not contain any insoluble fibers.

Advantageously, the envelope and the sheets have a low thickness, the sheets possibly being constituted of several layers. Preferably, the thickness of the envelope and of the sheets ranges from 3% to 99.9% of its other dimensions. This thickness is in particular less than 100 mm. The envelope and the sheets are thus substantially flat, thin slices.

The surface delimiting the cavity(ies) has an area generally less than 625 cm², for example between 400 cm² and 0.025 cm².

Use may be made, for example, of an envelope and sheets as defined in French patent application No. 1 261 120 filed on November 22, 2012.

The packaging article according to the present invention may comprise one or more water-soluble nonwoven sheets and envelope.

Preferentially, the amount of envelope present in the packaging article according to the invention is between 0.5% and 20% by weight relative to the total weight of said article, advantageously between 1.0% and 10%, particularly between 2% and 5% by weight, relative to the total weight of the packaging article.

Dyeing or lightening process

- applying to said keratin fibers a ready-to-use composition as defined previously, that is to say resulting from the mixing of a solid dyeing or a lightening composition, as defined previously, and of a cosmetically acceptable medium,

- leaving the ready-to-use composition on said keratin fibers,

- rinsing said keratin fibers, and

- optionally shampooing said keratin fibers, rinsing them and drying them. The present invention also relates to a process for dyeing or lightening keratin fibers, in particular human keratin fibers such as the hair, comprising the following successive steps:

- applying the resulting composition to said keratin fibers,

- leaving said resulting composition on said keratin fibers,

- rinsing said keratin fibers, and

- optionally shampooing said keratin fibers, rinsing them and drying them.

It is understood that the composition capable of dissolving the envelope depends on the nature of the envelope. In other words, the composition capable of dissolving the envelope is water or an aqueous composition, when the packaging article contains predominantly or only a hydrophilic envelope. In addition, the composition capable of dissolving the envelope is an organic anhydrous composition or an aqueous composition comprising at least one liquid fatty substance or at least one organic solvent other than the liquid fatty substances, such as lower monoalcohols, for example ethanol, or such as polyols, for example propylene glycol or glycerol, when the packaging article contains predominantly or only a lipophilic envelope.

Thus, the aqueous composition may simply be water. The aqueous composition may optionally comprise at least one polar solvent. Among the polar solvents that may be used in this composition, mention may be made of organic compounds that are liquid at ambient temperature (25°C) and at least partially water- miscible.

Examples that may be mentioned more particularly include alkanols such as ethyl alcohol, isopropyl alcohol, aromatic alcohols such as benzyl alcohol and phenylethyl alcohol, or else polyols or polyol ethers, for instance ethylene glycol monomethyl, monoethyl or monobutyl ethers, propylene glycol or ethers thereof, for instance propylene glycol monomethyl ether, butylene glycol, dipropylene glycol, and also diethylene glycol alkyl ethers, for instance diethylene glycol monoethyl ether or monobutyl ether.

More particularly, if one or more solvents are present, their respective content in the aqueous composition ranges from 0.5% to 20% by weight and preferably from 2% to 10% by weight relative to the weight of said aqueous composition. The dilution ratio (expressed by weight) between one or more packaging articles, as defined previously, and the composition capable of dissolving the packaging article(s) is preferably between 10/90 and 90/10, and more preferentially between 10/90 and 50/50, even better still between 20/80 and 30/70.

When the composition capable of dissolving the article is an aqueous hydrogen peroxide solution, it preferably has a pH of less than 7. The acidic pH ensures the stability of the hydrogen peroxide in the composition. It may be obtained using acidifying agents, for instance hydrochloric acid, acetic acid, etidronic acid, phosphoric acid, lactic acid or boric acid, and it may be conventionally adjusted by adding either basifying agents, for instance aqueous ammonia, monoethanolamine, diethanolamine, triethanolamine, isopropanolamine, 1,3-diaminopropane, an alkali metal (bi)carbonate or ammonium (bi)carbonate, an organic carbonate such as guanidine carbonate, or else an alkali metal hydroxide, all these compounds, needless to say, possibly being taken alone or as a mixture.

The pH of the ready-to-use composition resulting from the mixing of a packaging article, as defined previously, with a composition capable of dissolving the envelope of the packaging article is preferably between 7 and 12 and more preferentially between 7.5 and 11.

In particular, the ready-to-use composition used in the dyeing or lightening process according to the invention is applied to dry or wet keratin fibers.

The ready-to-use composition is advantageously left to stand on the keratin fibers for a time ranging from 1 minute to 1 hour and more preferentially for a time ranging from 5 to 45 minutes.

The keratin fibers are then rinsed with water. They may optionally be washed with a shampoo, followed by rinsing with water, before being dried or left to dry.

The working temperature of the dyeing or lightening process according to the invention is preferably between ambient temperature (25°C) and 80°C and more preferentially between ambient temperature and 60°C.

Use

The present invention also relates to the use of a solid dyeing or lightening composition, as defined previously, for dyeing or lightening keratin fibers, and in particular human keratin fibers such as the hair. A subject of the present invention is also the use of a packaging article, as defined previously, for dyeing or bleaching keratin fibers, and in particular human keratin fibers such as the hair.

The examples that follow serve to illustrate the invention without, however, being limiting in nature.

EXAMPLES

In the following examples, all the amounts are shown as mass percentage of starting material as it is, relative to the total weight of the composition.

The following dyeing compositions (A) and (B), according to the invention, and the following comparative dyeing composition (Al), in powder form and packaged in a water-soluble paper envelope, were prepared from the ingredients of which the contents are indicated in the tables below (% in g of starting material as it is).

[Table 1]

⁽¹⁾: sold under the trade reference Structure ZEA by the company Akzo Nobel

Each of the compositions (A), (Al) and (B) obtained previously was mixed with water in order to obtain the ready-to-use compositions, according to the following proportions per 100 g of mixture:

- 16.61 g of composition, and

- 43.39 g of water.

The ready-to-use compositions thus obtained were subsequently applied and it was noted that the compositions according to the invention had a good level of comfort on application.

The ready-to-use compositions obtained from the compositions (A) and (Al) were in particular applied on 15 women with a sensitive scalp who habitually carried out oxidation dyeing. They were applied with a brush, per 1/2 head, to dry hair and to the scalp in a proportion of 60 g per half-head.

After a leave-on time of 30 minutes, the hair was rinsed.

The intensities of the sensations felt were evaluated by each woman at various times: before application of the composition, at the time of application, during the leave-on time at 2, 5, 10, 15, 20 and 30 minutes, and during the rinsing.

It was possible to note that composition A according to the invention made it possible to significantly reduce the discomfort (close to 70% of the women found an improvement) compared with comparative composition Al.

It appears that, after dyeing, the compositions according to the invention make it possible to obtain similar dyeing performance levels, in particular color uptakes that are as considerable and colors that are as intense as a similar composition without phospholipid (soybean lecithin).

These observations were corroborated with spectrocolorimetric measurements:

The ready-to-use compositions (A) and (Al) were applied to locks of natural hair containing 90% grey hairs, in a bath ratio equal to 5: 1. After a leave-on time of 30 at 27°C (thermostatic plate), the locks of hair were rinsed, then washed (Ultra doux camomille shampoo at 0.4 g per g of hair), then rinsed, then dried.

The hair coloration was evaluated in the L*a*b* system, with a Minolta CM2006 ® spectrophotometer. In this system, L* represents the intensity; the lower the value of L*, the more intense the coloring obtained. Chromaticity is measured by the values a* and b*, a* representing the red/green axis and b* the yellow/blue axis.

Determination of the uptake

The coloration uptake obtained was evaluated by measuring DE, which is the variation in color before and after application of the dye, from the formula:

[Mathl]

DE = V(L^* - L„ *)² ₊ (a* - a₀ *)² ₊ (b* - b„ *)²

in which L* represents the intensity and a* and b* represent the chromaticity of the dyed hair, and Lo* represents the intensity and ao* and bo* represent the chromaticity of the hair before dyeing. The larger the value DE, the greater the color uptake.

The smaller the value of L*, the more intense the coloration obtained. The DE and L* values obtained for each of the dyeing compositions, according to the invention (A) and comparative composition (Al), are indicated in the table below.

[Table 2]

As mentioned above, no discomfort during application of the composition according to the invention, nor even during the leave-on time for the composition, was noted. In addition, the results obtained above show that the dyeing properties of the dyeing composition (A) comprising at least one phospholipid (soybean lecithin), prepared according to the present invention, remain equivalent to those of the comparative composition (Al) free of said phospholipid.

The composition according to the invention thus makes it possible to reduce discomfort without however impairing dyeing performance levels.

Claims

1. A solid composition for dyeing or lightening keratin fibers comprising:

a. one or more compounds chosen from chemical oxidizing agents and oxidation bases;

b. one or more phospholipids, said phospholipid(s) being present in the composition in a content ranging from 5 to 30% by weight relative to the total weight of the composition;

c. optionally one or more oxidation couplers.

2. The composition as claimed in claim 1, characterized in that the chemical oxidizing agent(s) are chosen from (i) peroxygenated salts, in particular persulfates, perborates, peracids and precursors thereof; percarbonates of alkali metals or alkaline-earth metals, such as sodium carbonate peroxide, also known as sodium percarbonate; (ii) alkali metal bromates or ferricyanides; (iii) solid hydrogen peroxide-generating chemical oxidizing agents such as urea peroxide and polymer complexes that can release hydrogen peroxide, especially polyvinylpyrrolidone/thOi complexes; (iv) oxidases that produce hydrogen peroxide in the presence of a suitable substrate, and mixtures thereof.

3. The composition as claimed in either one of the preceding claims, characterized in that the total amount of the chemical oxidizing agent(s) ranges from 30% to 55% by weight and preferably from 35% to 50% by weight, relative to the total weight of the solid composition.

4. The composition as claimed in any one of the preceding claims, characterized in that the oxidation base(s) are chosen from para-phenylenediamines,

bis(phenyl)alkylenediamines, para-aminophenols, bis-para-aminophenols, ortho- aminophenols and heterocyclic bases, the addition salts thereof, the solvates thereof, and mixtures thereof, and preferably from para-phenylenediamines, and in particular para-toluenediamine, the addition salts thereof, the solvates thereof, and mixtures thereof.

5. The composition as claimed in any one of the preceding claims, characterized in that the total amount of oxidation base(s) ranges from 0.001% to 20% by weight, preferably from 0.01% to 10% by weight and more preferentially from 0.1% to 7% by weight, relative to the total weight of the solid composition.

6. The composition as claimed in any one of the preceding claims, characterized in that the phospholipid(s) are chosen from phospholipids of plant or animal origin, preferably from phospholipids of plant origin.

7. The composition as claimed in any one of the preceding claims, characterized in that the phospholipids are chosen from lecithins, preferably in nonhydrogenated lecithins.

8. The composition as claimed in the preceding claim, characterized in that the phospholipids are chosen from lecithins of plant or animal origin, in particular from lecithins that are from soybean, from sunflower, from egg and/or mixtures thereof, preferably from lecithins of plant origin and preferentially from lecithins that are from soybean.

9. The composition as claimed in any one of the preceding claims, characterized in that the total amount of phospholipid(s) ranges from 5% to 25% by weight and more preferentially from 10% to 20% by weight, relative to the total weight of the solid composition.

10. The composition as claimed in any one of the preceding claims, characterized in that the oxidation coupler(s) are chosen from meta-phenylenediamines, meta- aminophenols, meta-diphenols, naphthalene-based couplers and heterocyclic couplers, the addition salts thereof, the solvates thereof, and mixtures thereof.

11. The composition as claimed in any one of the preceding claims, characterized in that it also comprises one or more alkaline agents, preferably chosen from silicates and metasilicates, such as alkali metal metasilicates; alkali metal or alkaline-earth metal carbonates or hydrogen carbonates, ammonium salts, and mixtures thereof.

12. The composition as claimed in any one of the preceding claims, characterized in that it is anhydrous.

13. A ready-to-use composition resulting from the mixing of a solid dyeing or lightening composition, as defined in any one of the preceding claims, and of a cosmetically acceptable medium.

14. A packaging article comprising:

i) an envelope defining at least one cavity, the envelope comprising water-soluble and/or liposoluble fibers, preferably water-soluble fibers; and

ii) a solid dyeing or lightening composition as defined in any one of claims 1 to 12; it being understood that the solid dyeing or lightening composition is in one of the cavities defined by the envelope i).

15. A process for dyeing or lightening keratin fibers, comprising the following successive steps:

- applying to said keratin fibers a ready-to-use composition as defined in claim 13,

- leaving the ready-to-use composition on said keratin fibers,

- rinsing said keratin fibers, and

- optionally shampooing said keratin fibers, rinsing them and drying them.

16. A process for dyeing or lightening keratin fibers, comprising the following successive steps:

- mixing a packaging article, as defined in claim 14, with a composition that is capable of dissolving the envelope of said packaging article,

- applying the resulting composition to said keratin fibers,

- leaving said resulting composition on said keratin fibers,

- rinsing said keratin fibers, and

- optionally shampooing said keratin fibers, rinsing them and drying them.

17. The use of a solid dyeing or lightening composition, as defined in any one of claims 1 to 13, for dyeing or lightening keratin fibers, and in particular human keratin fibers such as the hair.

18. The use of a packaging article, as defined in claim 14, for dyeing or lightening keratin fibers, and in particular human keratin fibers such as the hair.